WO1992003728A1 - Detecteur de so2 et procede de detection de so¿2? - Google Patents

Detecteur de so2 et procede de detection de so¿2? Download PDF

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Publication number
WO1992003728A1
WO1992003728A1 PCT/US1991/005927 US9105927W WO9203728A1 WO 1992003728 A1 WO1992003728 A1 WO 1992003728A1 US 9105927 W US9105927 W US 9105927W WO 9203728 A1 WO9203728 A1 WO 9203728A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
catalyst
gas stream
sensor element
catalytic
Prior art date
Application number
PCT/US1991/005927
Other languages
English (en)
Inventor
Ralph A. Dalla Betta
David R. Sheridan
Original Assignee
Catalytica, Inc.
Wheelock, E., Thomas
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Catalytica, Inc., Wheelock, E., Thomas filed Critical Catalytica, Inc.
Priority to KR1019920700897A priority Critical patent/KR920702495A/ko
Priority to BR919105874A priority patent/BR9105874A/pt
Publication of WO1992003728A1 publication Critical patent/WO1992003728A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/005—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods investigating the presence of an element by oxidation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
    • G01N25/28—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly
    • G01N25/30—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly using electric temperature-responsive elements
    • G01N25/32—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly using electric temperature-responsive elements using thermoelectric elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
    • G01N25/28—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly
    • G01N25/34—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly using mechanical temperature-responsive elements, e.g. bimetallic
    • G01N25/36—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly using mechanical temperature-responsive elements, e.g. bimetallic for investigating the composition of gas mixtures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning
    • G01N33/0013—Sample conditioning by a chemical reaction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • G01N33/0042—SO2 or SO3
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/18—Sulfur containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/18—Sulfur containing
    • Y10T436/186—Sulfur dioxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/18—Sulfur containing
    • Y10T436/188—Total or elemental sulfur

Definitions

  • the catalytic sensor element and the reference sensor element are downstream from the catalytic oxidation preconverter.
  • the catalytic sensor element has on its outside periphery a catalyst suitable for oxidizing S0 2 to S0 3 in thermal contact is a temperature measuring device. Both are generally thermally isolated from the operating environment and each other.
  • the catalyst is selected and placed about the temperature measuring device so that the S0 2 in the gas stream is oxidized to S0 3 on the catalyst surface with oxygen.
  • the temperature measuring device may be a device such as an RTD, a thermistor, or a thermocouple which detects the small temperature rise which occurs due to the S0 2 oxidation reaction taking place on the catalyst.
  • the catalyst support may be in the form of a packed bed of granules, balls, Pall rings, etc., and made from the same materials noted above.
  • a packed bed typically requires less catalyst than required for a monolith since the space velocity of the gas is much lower than for a monolith.
  • the reference element (320) may be similar in design to the catalytic element (311) except that the catalyst layer is excluded and an optional protective layer (326) for the temperature measuring device may be added.
  • Support materials should be selected so that the heat of reaction on the catalytic coating (312) of the catalyst sensor element (311) is maintained at the temperature measuring device (314).
  • the elements should be as small as is practically possible so to permit rapid response to temperature and NO x content. Use of small elements also results generally in less radiation heat loss to the surroundings.
  • the two elements should have similar thermal mass and should, as much as is possible, have similar heat transfer characteristics.
  • the catalytic sensor and reference elements need not be in the configuration shown in Figure 3. Other variations are suitable.
  • the sample gas passes into a temperature controlled heat exchanger block (412) through a labyrinthine heat exchanger section (414) which has several functions but mostly provides an isothermal heat source which brings the sample gas mixture up to the desired operating range.
  • the block may contain one or more heater elements (416). A variation would be a heater external to the block which maintains the block at the desired temperature.
  • the sample gas mixture passes through the heat exchange surfaces which may be in the labyrinthine form (414) shown in Figure 4. After heating to the operating temperature, the gas passes to the catalytic oxidation preconverter catalyst element (418) of the form discussed above with regard to Figure 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Molecular Biology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)
  • Catalysts (AREA)

Abstract

L'invention se rapporte à un procédé de détection de faibles niveaux de concentration d'oxydes de soufre (SO2) dans un flux de gaz qui s'écoule (généralement un flux de gaz d'échappement de combustion), et à un système de détecteur catalytique de SO2 qui peut être utilisé avec ce procédé.
PCT/US1991/005927 1990-08-17 1991-08-16 Detecteur de so2 et procede de detection de so¿2? WO1992003728A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019920700897A KR920702495A (ko) 1990-08-17 1991-08-16 So_2센서 및 so_2의 검출방법
BR919105874A BR9105874A (pt) 1990-08-17 1991-08-16 Dispositivo para medir a concentracao de so2 em uma corrente de gas fluente e processo para medicao de so2 em uma corrente de gas fluente contendo so2 e componentes oxidaveis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US569,066 1990-08-17
US07/569,066 US5338515A (en) 1990-08-17 1990-08-17 SO2 sensor

Publications (1)

Publication Number Publication Date
WO1992003728A1 true WO1992003728A1 (fr) 1992-03-05

Family

ID=24273956

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/005927 WO1992003728A1 (fr) 1990-08-17 1991-08-16 Detecteur de so2 et procede de detection de so¿2?

Country Status (7)

Country Link
US (1) US5338515A (fr)
EP (1) EP0505529A4 (fr)
JP (1) JPH05503781A (fr)
KR (1) KR920702495A (fr)
AU (1) AU8508391A (fr)
BR (1) BR9105874A (fr)
WO (1) WO1992003728A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
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CN102439439A (zh) * 2009-05-11 2012-05-02 赛默飞世尔科技有限公司 液体样品的环境控制、校正和浓度水平的检测

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BR9105874A (pt) 1992-11-17
EP0505529A1 (fr) 1992-09-30
AU8508391A (en) 1992-03-17
EP0505529A4 (en) 1993-03-03
KR920702495A (ko) 1992-09-04
JPH05503781A (ja) 1993-06-17

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